Use this forum if you have installed hMailServer and want to ask a question related to a production release of hMailServer. Before posting, please read the troubleshooting guide. A large part of all reported issues are already described in detail here.

We have had our hmail server up and running for several months and this morning when I came into work we are having problems receiving outside mail. We are able to send external mail, and send a receive internal mail without issues. We can see the external mail being processed in our log files and I haven't been able to locate and problems however it nevers appears in any accounts. Also you can see the files come and go from the hmailserver\data folder but they are all 0k and if you open them they all say sender unspecified, no recipient and subject none. I have tried re-installing the hmail server software with no change in the result. I have pasted a section of the logfile below.

Yep....everything works but email that is from outside of our domain...what is really throwing me is seeing it in the logs but not in the Hmail Server administrator tool as a processed message or as a message in the undelivered message queue.

What AV do you use?
What brand of hardware firewall / router / modem do you use?

Is it possible that some other component of you system has updated which affects mail..?

is mail added to SPAM folder by mail client? Many AV and some mial clients will treat mail with no subject as spam...Could be a combination, AV or firewall changes subject of message and client treats as SPAM...

Just 'cause I link to a page and say little else doesn't mean I am not being nice.
https://www.hmailserver.com/documentation

I have checked my client...the mail is truely never showing up anywhere...

As far as other devices...I have disabled the virus scan on the mail server, and we are a small corporate IT dept so there are only two of us with access to modify the firewall device which also does our SPAM filtering and neither of us have made any changes to that device. That is was is really throwing us for a loop.....nothing changed this morning that we can find (certainly nothing we changed) but yet mail still isnt being delivered.

Does sound like this spam filter is doing something strange or the firewall.

If you are using a Cisco router/firewall, you may need to disable SMTP Fixup protocol. If this is enabled, the router/firewall will sometimes intercept SMTP traffic and replace data in it before it reaches hMailServer which can cause problems.

If at first you don't succeed, bomb disposal probably isn't for you! ヅ

Do you think that if my firewall was changing something I would still see the correct recipient and sender info in the Log files? That is one of the things throwing me for a loop. I really wouldnt expect the log files to look the way they do if it was flat out denying mail

I have seen stranger things happen in my time here from firewalls stopping emails part way through, to network drivers being broken, to faulty memory sticks causing weird errors. Bottom line is we cant tell you what is wrong. It's a unique problem that only you seem to be experiencing currently. By working through and eliminating possible causes we can hopefully get nearer to the issue. So now your saying it's not a cisco firewall yes? If so we can rule that out as a possible issue.

What does your spam filtering and can you bypass it temporarily?

If at first you don't succeed, bomb disposal probably isn't for you! ヅ

Correct it is a watchguard firewall. We have bypassed almost all of the filtering however it is an integrated firewall and spam filter so we cant bypass it completly since we would no longer be forwarding port 25 then. We have currently setup a clean install of hmail on a clean install of windows and have configured a single account and are now waiting for our back queued mail to clear to see if that works. We are wondering if a couple of changes to group policy on the normal server (it is a windows 2003 domain controler) could have affected hmail.